Andrew B. Smith, Karim Sadr, John Gribble, Royden Yates, Excavations in the South-Western Cape, South Africa, and the Archaeological Identity of Prehistoric Hunter-Gatherers within the Last 2000 Years, The South African Archaeological Bulletin, Vol. 46, No. 154 (Dec., 1991), pp. 71-91
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Smith et al. (1991) studied this question.
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